If you cannot root your device, consider these physical workarounds:
While you cannot simulate a USB drive on a non-rooted phone, you can achieve similar results using network-based booting methods if your PC hardware supports it. drivedroid no root apk
What is your ? (I can check if rooting is easy for your specific device). If you cannot root your device, consider these
Even with root, success depends on whether your phone's kernel supports UMS emulation. Best "No Root" Alternatives If you cannot root your device